I have a 1994 S500 coupe with 56000 miles that is showing low oil pressure when it warms up. The oil pressure starts out cold at 3 bar, but when the temperature gets to 95C it shows about .5 bar at idle. The pressure stays at 3 bar when cruising down the road at 2000rpm. What do I need to do, if anything?

[This message has been edited by Glen Willcoxon (edited 08-01-2000).]

Glen,
I suspect this is quite normal for your engine. I have a '93 400E which does exactly the same thing. The owner's manual even says that as long as the pressure is at least .3 bar at idle, and rapidly comes up to 3 bar when under load, this is within normal limits. On mine, in the summer, pressure is a little under 3 bar when running at 55 mph on level ground and about 1800 rpm, but pegs the needle when I apply even a little throttle.



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'93 400E

Do nothing, this is fine. Change it frequently.

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Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE

Thanks for the information, I just purchased the car and I am going over it with a fine tooth comb. The oil pressure is the only thing that had me concerned, I am planning to use Castrol GTX 20W50 for the oil. Do you have a recommendation, or a reason for not using Castrol?? I have used it in all my other cars. 82 Porsche 911, 87 BMW 635, 89 BMW 325IC, 94 BMW 530, and 95 BMW 325IC with out any problems.

Great stuff. Good weight for your neck of the woods. Change it every 3,000 and you'll be a happy guy.

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Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE

Castrol GTX is excellent oil. Unless you live in a very hot climate you might want to try a 10W40. 20W50 seems a little thick. I live in Canada and use 5W30 year round. Its great stuff.


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Jason Priest
1986 420SEL